Deutz Allis 9150 injector pump.....

sherman

Member
Trying to get the tractor running,(bosch pump) have fuel to the pump(air bled out) but very little coming out of the injector line fittings on the top of the pump. It is very hard to fill the lines up even with the throttle up... just rebuilt the lift pump. any ideas?
 
Has it been awhile since the engine last ran? If fuel gallery is full but no fuel at outlets while cranking it may have one or more plungers stuck, which keeps the rack from moving forward. If you can take the round cap off the pump front, most have flats for a 19MM wrench. Rack inside should move easily by hand, when pushed in fuel is off, when in start position rack will come out. If I recall there's an electric start solenoid that disables the aneroid when starting, so rack can go full travel. See if it has 12 volts to it. Works similar to the oil controlled aneroid cutout that other Bosch pumps use. Rack has a starting spring that helps push it forward, if it moves back by hand then tries moving out again rack is not stuck.
 
yes it sat for a while but ran 8 months ago. I took the rectangular cover off the side of pump and can move the rack when I move the shutoff back and forth. should I see if moving the throttle causes the rack to move to or does the engine need to be cranking?

The last owner bypassed the electric shutoff and went to just a cable instead. I also changed the check-valve on the outflow side as it was defective.
 
Setting still the throttle won't move the rack. If the rack moves when the stop lever is used rack is not stuck. I'd suspect the main gallery still has a lot of air. Loosen the return banjo bolt, operate the hand primmer to get the air out. Then with all injector lines loose crank the engine so each plunger gets fuel to each injector. Engine should then start after lines are tight.
 
I will try bleeding it again, have bled twice, no air now coming out, but I have had about 1/2 gal of diesel out the return check valve banjo bolt. the throttle lever requires a bit of force to move. any other ideas?

thanks.
 
Bosch RSV governor does require force to move and hold the throttle lever, that's normal. IF the rack is moving, and pump turns when engine is cranked it will deliver fuel, but any air in the gallery will prevent it from working. Air will compress, liquid fuel won't.
 
I fixed a 3-cylinder Deutz on a Lincoln welder that had the same symptoms you describe. Seems they had changed the fuel filters and couldn't get it started. No air at the injectors, but hardly any fuel either. The trouble was there were tiny strands of fuzz in the delivery valves. I don't know if the owner dumped a load of dirt in when he changed the filters, or if the braided fuel lines were breaking down. Anyway, the tops of the delivery valves can be removed for inspection, provided you keep everything clean. With fuzz under the delivery valves, the plunger will push the fuel toward the injector, but follow the plunger back as it recedes; the delivery valve is supposed to hold the fuel against the injector. The only reason you have fuel there (at the injector) at all is the lift pump is pushing it up there when the plunger is in the right position. Where the fuzz came from remains a mystery , after I cleaned out the delivery valves he didn't have any more trouble with it for the last three years.
 

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